EP0046204A2 - Profilé en matière stratifiée - Google Patents

Profilé en matière stratifiée Download PDF

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Publication number
EP0046204A2
EP0046204A2 EP81105761A EP81105761A EP0046204A2 EP 0046204 A2 EP0046204 A2 EP 0046204A2 EP 81105761 A EP81105761 A EP 81105761A EP 81105761 A EP81105761 A EP 81105761A EP 0046204 A2 EP0046204 A2 EP 0046204A2
Authority
EP
European Patent Office
Prior art keywords
layers
core
profile according
fiber
composite profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81105761A
Other languages
German (de)
English (en)
Other versions
EP0046204A3 (en
EP0046204B1 (fr
Inventor
Friedrich Dr. Esper
Walter Dr. Gohl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esper Friedrich Dr
Gohl Walter Dr
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to AT81105761T priority Critical patent/ATE28594T1/de
Publication of EP0046204A2 publication Critical patent/EP0046204A2/fr
Publication of EP0046204A3 publication Critical patent/EP0046204A3/de
Application granted granted Critical
Publication of EP0046204B1 publication Critical patent/EP0046204B1/fr
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats

Definitions

  • the invention is based on a composite profile according to the type of the main claim.
  • Composite materials in the broader sense are understood to mean materials bonded to one another by adhesive, which can also be referred to as so-called laminates.
  • Laminates and laminates are layered materials that e.g. B. consist of stacked paper-fabric sheets, wood veneers, glass mats, glass nonwovens or the like with synthetic resin as a binder and are connected by application of pressure and heat to a uniform, mechanical. Solid material.
  • the composite profile according to the invention with the characterizing features of the main claim has the advantage that the profile built in box frame construction can absorb high lateral forces through an additional wood or foam core. This in particular prevents bulging and thus destruction of the profile under high bending stress. It is particularly advantageous continue to use high strength fibers such.
  • B. carbon fiber which have a longitudinal fiber orientation. These high-strength fiber layers, which are arranged several times one above the other, can absorb high tensile forces and thus also bending forces. In the case of a three-dimensional shaping of the profiles, such longitudinally oriented high-strength fibers require special support measures in order to prevent the fiber from slipping away from certain layers.
  • the invention provides a plastic matrix in which, for. B.
  • the longitudinally oriented carbon fiber in a nonwoven fabric from z. B. asbestos is embedded and protected against the pressure in the manufacturing process.
  • the nonwoven intermediate layers between the high-strength fiber strands prevent damage by crossing or squeezing the high-strength fibers and at the same time serve to build up a preform suitable for production.
  • the laminate structure of the profile according to the invention preferably consists of carbon fiber as high-strength fiber with a short fiber fleece made of class 3 or 4 asbestos fibers.
  • the composite profile according to the invention has an extraordinarily favorable strength-to-weight ratio compared to known profiles: With a weight of ⁇ 1.7 g per cm, a breaking load of 2500 N is achieved in a 3-point bending test with a 200 mm support distance.
  • the profile according to the invention has a damping comparable to that of wood.
  • a nonwoven fiber layer in particular made of asbestos
  • a longitudinally oriented high-strength fiber layer made of carbon fiber or aramid in a thermosetting plastic matrix made of unsaturated polyester resin
  • a wood or foam core absorbing the transverse forces is embedded in these laminates, a rectangular cross-section of the core absorbing particularly high transverse forces in the longitudinal direction of the core cross-section (direction of the longer side of the core cross-section) and being particularly easy to carry out.
  • the invention further provides to use the profile according to the invention as a tennis racket profile frame. Due to the extremely favorable strength-to-weight ratio, the profile is ideal for producing a tennis racket with a larger frame.
  • the composite profile according to the invention represents an optimal compromise between an inexpensive tennis racket with a large playing surface and a low impact weight Production of the tennis racket using conventional laminate technology ensures inexpensive production of the profile according to the invention.
  • this profile is furthermore distinguished by a high damping comparable to wood.
  • FIG. 1 shows a section through the composite profile according to the invention in a box frame construction with a core
  • FIG. 2 shows a schematic illustration of a tennis racket frame produced from the profile according to the invention in a clamping device.
  • One or more laminate layers 11 to 13 are arranged around the core 10 in a box frame construction.
  • Each layer of laminate 11 to 13 consists of three individual layers which are connected by a thermosetting impregnating resin.
  • the outer laminate layer 11 shown in FIG. 1 consists of a carbon fiber layer 14, which is embedded in two asbestos fleece layers 15, 15 '.
  • the high-strength fiber layer, in particular carbon fiber layer 14, has a fiber course oriented in the longitudinal direction (X direction in FIG. 1).
  • the carbon fiber has a high modulus of elasticity in the oriented direction, i. H. it is suitable for absorbing high tensile forces under bending stress.
  • the three-dimensional shape of the composite profile according to the invention requires special support measures for the longitudinally oriented carbon fiber 14 in order to ensure a defined position of the fiber. This is done by nonwoven layers, in particular asbestos layers 15, 15 ', in which the carbon fiber is embedded. Damage to the longitudinally oriented carbon fiber by crossing and squeezing is thereby avoided in the layer press method.
  • two laminate layers 11, 12 can be arranged in a U-shape around the wooden core 10, the legs 16, 17 of the U-shaped laminate layers 11, 12 being connected to the short sides of the core 10, which is rectangular in cross section.
  • the legs 16, 17 of the U-shaped profile can protrude slightly beyond the profile when using the profile as a tennis racket frame. The strings of the strung tennis racket frame can then rest in this indentation.
  • this layer is designed as a single layer, i. H. like the layers 11, 12, it also contains a longitudinally oriented carbon fiber layer 14 which is embedded in two asbestos fleece layers 15, 15 '.
  • the embodiment shown in Fig. 1 is. Somewhat different in the upper area:
  • the wooden core is designed as a two-layer core 10 ', 10 "and the corners of the U-shaped box frame are very rounded.
  • the asbestos fiber fleece used in the laminate layers 11-13 with a weight of approx. 300 g / m 2 and a thickness of approx. 0.4 mm without impregnation, approx. 0.55 mm soaked with resin, is bonded to the carbon fiber layers and the core 10 by means of a unsaturated polyester resin connected, so that the weight doubles again.
  • the production of the profile according to the invention in a laminate construction can take place in the following steps: To produce the laminate layers 11, 12, four strips of asbestos fiber layers and three strips of carbon fiber layers are layered. The U-shaped profile is preformed at approx. 60 C. The wood core 10 and the further laminate layer 13, consisting of a carbon fiber layer and two asbestos fleece layers, are then inserted into the U-profile. The shaped body thus created is placed in the mold and pressed and cured at a curing temperature in a two-minute pressing process. This is followed by demolding and deburring.
  • the composite profile produced in this way is characterized by a simple and inexpensive method of manufacture.
  • the good surface requires little rework.
  • the profile of the invention can u. a. preferably used as a tennis racket profile.
  • the profile is provided with pressed-in covering holes 18, the covering being able to run in the U-shaped recess of the profile on the frame.
  • the profile according to the invention permits sleeve-free stringing, since on the one hand tearing of the bores by the wooden core absorbing the transverse forces is avoided, and on the other hand the string is not cut when using carbon fibers as reinforcing fibers. Glass fiber reinforced plastics have proven unsuitable in this regard.
  • the breaking load in a bending test in a 3-point bending test with a support distance of 200 mm is more than 2500 N.
  • the proportion. limit is 2000 N
  • the modulus of elasticity is 25 000 N / mm 2
  • the breaking limit is 300 N / mm 2 . This represents an extremely favorable ratio between strength and weight.
  • the direction of the profile denoted by Y faces the outside of the racket.
  • a flat molded body is brought into the shape typical of a tennis racket (see FIG. 2).
EP81105761A 1980-08-14 1981-07-22 Profilé en matière stratifiée Expired EP0046204B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81105761T ATE28594T1 (de) 1980-08-14 1981-07-22 Verbundwerkstoff-profil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3030699 1980-08-14
DE19803030699 DE3030699A1 (de) 1980-08-14 1980-08-14 Verbundwerkstoff-profil

Publications (3)

Publication Number Publication Date
EP0046204A2 true EP0046204A2 (fr) 1982-02-24
EP0046204A3 EP0046204A3 (en) 1984-05-16
EP0046204B1 EP0046204B1 (fr) 1987-07-29

Family

ID=6109570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105761A Expired EP0046204B1 (fr) 1980-08-14 1981-07-22 Profilé en matière stratifiée

Country Status (3)

Country Link
EP (1) EP0046204B1 (fr)
AT (1) ATE28594T1 (fr)
DE (1) DE3030699A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142906A1 (fr) * 1983-08-25 1985-05-29 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Matériaux composites
EP0212014A1 (fr) * 1985-08-05 1987-03-04 Gosen Co., Ltd. Raquette
EP0235777A2 (fr) * 1986-03-05 1987-09-09 MAXIMA S.p.A. Cadre de raquette de tennis et procédé de fabrication
US4753836A (en) * 1987-05-22 1988-06-28 Mizell James A Surfboard construction
EP2907553A1 (fr) * 2014-02-12 2015-08-19 Dunlop Sports Co., Ltd. Raquette
ES2564208A1 (es) * 2014-09-18 2016-03-18 Decathlon Raqueta para juego de pelota y método correspondiente

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
FR2237761A1 (en) * 1973-07-16 1975-02-14 Saucier Glass fibre reinforced epoxy hockey sticks etc - built on skinned (polyurethane) foam core
US4022864A (en) * 1968-01-24 1977-05-10 Plastigage Corporation Method of forming glass fiber construction member
US4128963A (en) * 1976-07-07 1978-12-12 Fansteel, Inc. Method for preparing a composite high strength to weight structure with fray resistance
US4194738A (en) * 1977-06-30 1980-03-25 Hitachi Chemical Company, Ltd. Frame of a game racket
US4212461A (en) * 1978-07-10 1980-07-15 Fansteel Inc. Composite high strength to weight structure having shell and weight controlled core

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1159957A (en) * 1965-09-16 1969-07-30 William Mallinson & Sons Mfg L Improvements in or relating to Laminated Thermosetting Resinous Materials
GB1423046A (en) * 1973-05-05 1976-01-28 Dunlop Ltd Sports rackets

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
US4022864A (en) * 1968-01-24 1977-05-10 Plastigage Corporation Method of forming glass fiber construction member
FR2237761A1 (en) * 1973-07-16 1975-02-14 Saucier Glass fibre reinforced epoxy hockey sticks etc - built on skinned (polyurethane) foam core
US4128963A (en) * 1976-07-07 1978-12-12 Fansteel, Inc. Method for preparing a composite high strength to weight structure with fray resistance
US4194738A (en) * 1977-06-30 1980-03-25 Hitachi Chemical Company, Ltd. Frame of a game racket
US4212461A (en) * 1978-07-10 1980-07-15 Fansteel Inc. Composite high strength to weight structure having shell and weight controlled core

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142906A1 (fr) * 1983-08-25 1985-05-29 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Matériaux composites
EP0212014A1 (fr) * 1985-08-05 1987-03-04 Gosen Co., Ltd. Raquette
EP0235777A2 (fr) * 1986-03-05 1987-09-09 MAXIMA S.p.A. Cadre de raquette de tennis et procédé de fabrication
EP0235777A3 (en) * 1986-03-05 1989-02-22 Maxima S.P.A. Tennis racket frame and process
US4753836A (en) * 1987-05-22 1988-06-28 Mizell James A Surfboard construction
EP2907553A1 (fr) * 2014-02-12 2015-08-19 Dunlop Sports Co., Ltd. Raquette
ES2564208A1 (es) * 2014-09-18 2016-03-18 Decathlon Raqueta para juego de pelota y método correspondiente
FR3026015A1 (fr) * 2014-09-18 2016-03-25 Decathlon Sa Raquette pour jeu de balles, et procede correspondant
BE1023759B1 (fr) * 2014-09-18 2017-07-13 Decathlon Raquette pour jeu de balles et procede correspondant

Also Published As

Publication number Publication date
EP0046204A3 (en) 1984-05-16
DE3030699A1 (de) 1982-04-01
EP0046204B1 (fr) 1987-07-29
ATE28594T1 (de) 1987-08-15

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